Flutter 当仅点击一行时，所有行都被选中

我有一个数据表，它的行数据是从rest api获得的.我希望能够 Select 一个特定的行，但所有行都被 Select 了.如何解决这个问题？

这是我的代码:

DataTable(
  columns: const <DataColumn>[
    DataColumn(label: Text('ID')),
    DataColumn(label: Text('Visitor\'s Name')),
    DataColumn(label: Text('Visit Date')),
    DataColumn(label: Text('Time In')),
    DataColumn(label: Text('Time Out')),
    DataColumn(label: Text('Department')),
    DataColumn(label: Text('Visitee')),
    DataColumn(label: Text('Address')),
    DataColumn(label: Text('Phone')),
    DataColumn(label: Text('Purpose of Visit')),
  ],
  rows: List.generate(snapshot.data!.length, (index) {
    var data = snapshot.data![index];
    return DataRow(
        selected: rowSelected,
        onSelectChanged: (index) {
// Handle row selection here
// print('Row ${rowData.id} selected: $isSelected');
          setState(() {
            rowSelected = index!;
          });
        },
        cells: [
          DataCell(Text(data.id.toString())),
          DataCell(Text(data.visitor_name.toString())),
          DataCell(Text(data.visit_date.toString())),
          DataCell(Text(data.Time_in.toString())),
          DataCell(TextFormField(initialValue: data.Time_out.toString())),
          DataCell(Text(data.Department.toString())),
          DataCell(Text(data.Visitee_name.toString())),
          DataCell(Text(data.Address.toString())),
          DataCell(Text(data.Phone.toString())),
          DataCell(Text(data.Purpose_of_visit.toString())),
        ]);
  }).toList(),
);

我try 添加一个onSelectedChanged属性，当我 Select 一行时，它会 Select 数据表中的每一行，